UFC Weigh-In Rules: The Scale, the Allowance, Missed Weight

Every UFC fighter weighs in on the morning of the day before the fight, inside a window of about two hours set by the state athletic commission, on a scale the commission controls. A fighter in a non-title bout may come in up to one pound over the division limit. A fighter in a title fight gets nothing over. Miss the number and the bout goes ahead only if the opponent accepts a catchweight, usually with a fifth or more of the purse handed across, and the fighter who missed cannot win a bonus or, in a title fight, a belt.

The rule in its hardest form looked like this. At UFC 274 in Phoenix in May 2022, Charles Oliveira stepped on the Arizona commission's scale the morning before his lightweight title defense and it settled at 155.5 pounds. Half a pound, in a title fight, where there is no allowance at all. He was stripped, fought Justin Gaethje the next night with the belt available only to Gaethje, and submitted him in the first round to win nothing but a place at the front of the line.

The UFC weigh-in rules: when, where and on whose scale

The official weigh-in takes place the day before the event, in the morning. Fighters are given a window, usually about two hours and often from 9 to 11 a.m. local time, and they can step on the scale at any point inside it. Most come at the very start. A fighter who has been dehydrating for a day wants to drink as soon as possible, and every minute of the window used is a minute less to recover.

The location is usually the official fight hotel, in a function room cleared for the purpose. There is a scale, a commission inspector, a small number of UFC staff, a camera, and very little else. Fans are not there. The UFC streams the proceedings online, and the broadcast is short: name, weight, next.

The scale belongs to the commission, or more exactly the commission certifies it. Inspectors check it before the window opens, and in many states a fighter or a camp can ask to step on it, privately and unofficially, before the official reading. Many do, the night before or that morning, so there are no surprises when the reading is for the record.

What the inspector records

The official weight is whatever the scale reads when the fighter is standing on it with nothing else touching it. Fighters usually weigh in in shorts or underwear. Where a fighter needs to strip fully to make the number, the commission holds up a towel as a screen. The reading is recorded to the precision of the scale the commission uses, which is why weights such as 155.5 and 206.2 pounds appear on the record, and that figure goes onto the broadcast graphics.

There is no rounding in the fighter's favor. 155.1 is over the lightweight title limit. 156.1 is over the non-title limit. The commission reads the number on the display and writes it down.

1. 1Morning window opensThe commission's inspector checks the scale and the first fighters step on, usually as soon as the window starts.
2. 2Weight recordedThe inspector reads the scale and the weight is entered on the official record and announced on the UFC's stream.
3. 3Missed weight handledA fighter over the limit is told the shortfall and may be allowed back on the scale before the window closes.
4. 4Window closesAny fighter still over the limit has missed weight, and the commission and the promotion decide whether the bout proceeds.
5. 5Ceremonial weigh-inIn the afternoon or evening the fighters pose on a stage for fans and cameras and face off with their opponents.

A typical sequence under most state commissions. Exact times are set by the commission for each event and vary by location.

The one-pound allowance and title fights

The allowance is the single most misunderstood part of the weigh-in. In a non-title bout, a fighter may weigh up to one pound over the division's upper limit and still be considered to have made weight. A lightweight fight is contested at 155 pounds, but the scale can read 156.0 and the fighter has made it. 156.1 is a miss.

Title fights have no allowance at all. Both fighters, the champion and the challenger, must weigh at or under the exact limit. A middleweight title fight requires 185.0 or less. This is why some of the narrowest misses in UFC history, Oliveira's half-pound among them, have come in title fights. The margin they could rely on everywhere else is gone.

The allowance exists because no commission wants a fight canceled over a fraction of a pound in a non-title contest, and because scales and bodies are not perfectly precise. It is a buffer, not a target. A fighter who aims to land at the top of it has no margin left for a scale that reads a little differently from the one at home.

Division	Upper limit	Highest reading in a non-title bout	Highest reading in a title fight
Flyweight	125 lb	126.0 lb	125.0 lb
Bantamweight	135 lb	136.0 lb	135.0 lb
Featherweight	145 lb	146.0 lb	145.0 lb
Lightweight	155 lb	156.0 lb	155.0 lb
Welterweight	170 lb	171.0 lb	170.0 lb
Middleweight	185 lb	186.0 lb	185.0 lb
Light heavyweight	205 lb	206.0 lb	205.0 lb
Heavyweight	265 lb	266.0 lb	265.0 lb

The women's divisions follow the same rule at their own limits, strawweight at 115 pounds and flyweight, bantamweight and featherweight at 125, 135 and 145. The full set of weight classes and how they came about is in our guide to UFC weight classes and their limits.

Heavyweight's ceiling is a floor of a different kind

Heavyweight is the odd division. Its limit, 265 pounds, is a cap that many heavyweights fight well under, so misses are rare. The few heavyweights who struggle with the scale tend to be big men carrying weight they cannot shed in a week. The Unified Rules define the class as anything over 205 pounds up to 265, so the scale matters at the top of the range and almost never at the bottom, and the one-pound allowance still applies in a non-title heavyweight bout, which makes 266.0 the highest legal reading.

• 1Pounds allowed over in a non-title bout
• 0Pounds allowed over in a title fight
• 2Typical length of the official window, hours
• 1Days before the event that the official weigh-in is held

Allowances under standard UFC practice in American commissions. The window length is typical rather than fixed and is set by the commission for each event.

Official and ceremonial: the morning weigh-in that counts and the show later on

Until 2016 the UFC held a single weigh-in, typically in the late afternoon the day before a fight, in front of fans. The weight was official and the show was the event. Fighters dehydrated through the day, stood on stage under lights, and only then started drinking. They had roughly a day to recover before walking out.

In 2016 the promotion moved the official weigh-in to the morning and kept the afternoon event as theater. The change was made for safety and it rests on a simple idea: a fighter who weighs in at 9 a.m. instead of 4 p.m. gets seven or so more hours to rehydrate before the fight. Commissions supported it because weight cutting by dehydration is the most dangerous thing that happens to a fighter in fight week, and anything that shortens the period of dehydration helps.

The ceremonial weigh-in that followed is what most fans picture when they hear the word. It is staged in an arena or a theater, sometimes with thousands present. Fighters walk out to music, step on a scale whose reading does not matter, flex, and then turn to face their opponents for the face-off, the image used on every preview. The weights read out on stage are the official ones from the morning. The scale on stage is a prop.

Why the split caused a new problem

Early weigh-ins solved one problem and created another. With more time to recover, many fighters began cutting more, counting on the extra hours to put the water back. Commissions and doctors noticed fighters arriving at fight night far heavier than their weigh-in weights. California responded, as the section on repeat offenders explains below, by checking weight again on fight night. Our explainer on weight cutting in MMA goes into the physiology.

What happens when a fighter misses weight

The first thing that happens is not a penalty. It is a second chance, sometimes.

Whether a fighter who misses gets another attempt depends on the commission. Most American commissions allow a fighter who is over to come back before the window closes, and many give a fighter who misses at the very end some additional time, often up to an hour, to cut the remainder. The fighter goes back to the hotel room, sweats in a bath or under blankets, and tries again. If the second reading is at or under the limit, the fighter has made weight and nothing more happens. If it is still over, the miss stands.

At that point the decision passes to people other than the fighter. The bout can go ahead only at a catchweight, a one-off weight between the two fighters' readings, and only if the opponent agrees to it. An opponent is under no obligation to fight someone who came in heavy. In practice most agree, because they have trained for months, they have paid for a camp and they are paid only if they fight. Their agreement is the price of a penalty that comes out of the other fighter's purse.

When the gap is too large

There is a point past which an opponent will not agree, or a commission will not approve, and the fight is off. The clearest recent example is UFC 279 in Las Vegas in September 2022. Khamzat Chimaev came in at 178.5 pounds for a welterweight main event against Nate Diaz, seven and a half pounds over the non-title limit. The UFC rebuilt the top of the card that afternoon: Chimaev fought Kevin Holland at a catchweight, Diaz fought Tony Ferguson in the main event, and the card's original headline bout never happened.

What a catchweight agreement actually settles

A catchweight in this situation is not a new division. It is a number written into a revised bout agreement, approved by the commission, that both fighters accept as the weight of the contest. Often it is simply set at or just above the heavier fighter's reading. The agreement records the penalty too: the percentage of the purse that moves across, and, implicitly, the loss of bonus eligibility that UFC policy attaches to the miss.

What the agreement does not do is cap how heavy either fighter can be on fight night. Without a rehydration clause, which the UFC does not use, the fighter who missed can drink, eat and regain weight freely through the evening, as can the fighter who made it. The opponent's complaint is therefore less about the half-pound on the scale than about what it suggests: a fighter who could not make the limit has probably dehydrated harder than planned, may rehydrate more, and may walk in noticeably heavier. That is the real reason some opponents decline, and why their managers push for the larger share of the purse when they accept.

Missing because of illness or a failed cut

Not every miss is a fighter who ate too much in camp. Some are fighters who fell ill during fight week, or whose bodies simply stopped shedding water on the last day. Commission doctors can step in at any point, and a fighter who is visibly unwell may be pulled from the card rather than allowed back on the scale. A doctor's decision overrides the fighter's wish to keep cutting. Those cases are usually announced as a medical withdrawal rather than a miss, and the penalty structure above does not apply in the same way.

A large miss, like Chimaev's at UFC 279, raises a safety question as well as a fairness one. Commissions are entitled to refuse to sanction a bout between two fighters whose weights are too far apart, and doctors may advise against a fight with a fighter who is visibly struggling. When that happens, the fighter who made weight is usually paid show money by the promotion, though the arrangement is the UFC's and not a rule.

1. 1Scale reads over the limitThe inspector records the weight and the fighter is told how far over it is.
2. 2Extra time, where allowedThe fighter may return before the window closes, or within any extra time the commission grants.
3. 3Second reading still overThe miss becomes official and goes on the record.
4. 4Opponent decidesThe opponent accepts a catchweight, usually with a share of the other fighter's purse, or declines the bout.
5. 5Commission approvesThe commission signs off on the catchweight or refuses to sanction the fight.

The general sequence under American commissions. A commission can depart from it, and the promotion and the opponent each have a veto over the bout going ahead.

The penalty for missing weight: purse, bonuses and cancellations

The usual penalty for a missed weight in a UFC fight is a share of the fighter's purse, paid to the opponent. Twenty percent is common, twenty-five percent is frequent, and thirty percent appears for larger misses. The exact share is agreed among the commission, the promotion and the fighters' teams on the day and is reported once the bout is confirmed. In some states the commission orders the fine. In others it is a matter for the promotion and the fighters, and the commission simply records that the opponent agreed.

There are two other costs. The first is the bonus. Under UFC policy a fighter who misses weight is ineligible for every post-fight bonus on the card, so a fighter who misses and then produces the fight of the year is paid nothing extra. Our page on UFC performance bonuses explains what that rule costs in practice. The second is the record. A missed weight is publicly noted, appears in every preview of that fighter's next bout, and counts in the promotion's matchmaking decisions.

The penalty does not always fit the miss

The percentage system has an obvious flaw. A fighter who misses by half a pound and a fighter who misses by seven can both pay twenty-five percent if that is what was agreed, and a fighter on a small purse pays far less in dollars than a well-paid one for the same failure. Critics have argued for fines scaled by the amount of the miss. No single published schedule applies across every state, which follows from the fact that the commission, not the promotion, governs the scale.

Outcome	Bout goes ahead?	Fighter who missed	Opponent
Miss, opponent accepts catchweight	Yes	Forfeits a share of purse, commonly 20 to 30 percent, and bonus eligibility	Receives the forfeited share
Miss, opponent declines	No	Loses the bout and normally the purse	Usually paid show money by the promotion
Miss, commission refuses to sanction	No	Loses the bout and may face commission discipline	Usually paid show money by the promotion
Title fight, challenger misses	Yes, if champion agrees	Cannot win the title, forfeits a share of purse	Defends the belt as normal
Title fight, champion misses	Yes, if challenger agrees	Stripped, cannot regain the title in the bout	Can win the vacant title

Title fights: when the champion or the challenger misses

Title fights add a third consequence to a miss: the belt.

If the challenger misses, the title is on the line only for the champion. The bout proceeds at a catchweight, and the champion keeps the title if he wins, loses nothing if he loses, and holds the belt either way. The challenger can win the fight but not the championship. At UFC 225 in Chicago in June 2018, Yoel Romero came in over the 185-pound middleweight limit for his title rematch with Robert Whittaker and could not make it on a second attempt. The fight went ahead with the title at stake for Whittaker alone. Whittaker won a split decision. Had Romero won, he would have been the winner of a five-round fight against the champion and still not the champion.

If the champion misses, the outcome is harsher. The champion is stripped as soon as the miss is official. The title becomes vacant, and only the challenger can win it in that bout. If the former champion wins, the title stays vacant and is filled later, often with the former champion in the next title fight. That is exactly what happened to Oliveira at UFC 274: stripped at 155.5 pounds, he won the fight, and the title was not his again.

Why the rule falls hardest on the champion

The asymmetry makes sense. A champion holds a title at a stated weight, and a champion who cannot make that weight has, in the commission's eyes and the promotion's, failed to hold it. A challenger who misses has failed to qualify for the title, which is a smaller thing. The rule also protects the challenger from facing a heavier champion with nothing to show for a win. Where an interim belt exists in the division, the stripping of a champion can turn the interim holder into the undisputed one, a process our guide to the UFC interim title covers.

Who runs the scale: the commission, not the UFC

The UFC promotes the event and the commission regulates it, and the scale sits firmly on the regulatory side. In Nevada that means the Nevada State Athletic Commission; in New Jersey the State Athletic Control Board; in New York the State Athletic Commission; in California the California State Athletic Commission. Each employs inspectors, licenses the fighters, certifies the equipment and records the weights. What a state athletic commission does on fight night more broadly is set out in our guide to them.

This division of power has a clear consequence. The UFC cannot wave a miss through. If a fighter is over, the commission records the miss, and whatever the promotion would like to happen, the bout proceeds only as a catchweight approved by the commission. A promotion that wanted to protect a star could not simply announce that the fighter had made weight. The number is on an official document the UFC does not control.

Fights outside the United States

When the UFC fights in a country with its own combat sports regulator, that body runs the weigh-in. Where no regulator exists, the promotion has used its own regulatory staff and appointed officials to apply the Unified Rules and the same weigh-in practice, so that a fighter weighing in in Abu Dhabi, Mexico City or London faces the same morning window and the same allowance as a fighter in Las Vegas. The idea is consistency across every card, and in practice the UFC's weigh-ins abroad look almost identical to those at home.

The towel, the box and the hands

When a fighter has to strip to make weight, the commission holds a towel up around the scale. The fighter is weighed naked behind it, and the inspector reads the number. The process is routine. It is also the scene of the most famous dispute in the history of UFC weigh-ins.

At UFC 210 in Buffalo in April 2017, Daniel Cormier stepped on the New York State Athletic Commission's scale for his light heavyweight title defense against Anthony Johnson and read 206.2 pounds, over the 205-pound title limit. About two minutes later he came back, stepped up behind the towel and read 205.0. Footage of the second weigh-in appeared to show his hands on the towel held by the commission's officials. Critics argued he had taken weight off the scale by pressing down on it. The commission accepted the second reading, Cormier kept the title on the line, and he beat Johnson by submission in the second round the next night. Commissions took the incident as a warning, and the towel has been watched more closely since.

The rules it produced

The fighter's hands are now watched. Commissions instruct fighters not to touch the towel, the screen or anything else while on the scale, and inspectors stand close enough to see. A screen or frame that stands on its own, rather than a towel in officials' hands, removes anything to lean on, and some weigh-ins have used one. A second attempt minutes after a miss is also treated with more suspicion than it was: commissions are wary of a fighter who could not possibly have lost a pound in two minutes appearing to do exactly that.

The episode is a large part of the reason fighters are told to keep their hands off everything around the scale. A rule like that sounds fussy until one remembers that the difference between a title fight and a catchweight can be a few ounces of pressure.

Backup fighters for title fights

For many championship bouts the UFC books a backup, a fighter who weighs in at the championship limit on the morning of the weigh-in and is ready to step in if either the champion or the challenger falls out. The backup does not fight unless something goes wrong. If the champion or the challenger is injured, sick or misses weight badly enough, the backup can take the place and the title fight can survive.

The backup is in the same position as any other fighter on the card: the weight must be made under the same rules, including the title-fight standard of no allowance. A backup who makes weight and is not used has done what was asked. The terms on which backups are paid are agreed privately between the promotion and the fighter and are not published; the general understanding is that a backup who makes weight and is not used is compensated for doing so, often with a promise of the next opportunity, but the specific arrangement varies.

Why backups have become more common

Title fights are the product the UFC sells most expensively, and the cost of losing one on the day before the event is high. A backup is cheap insurance. The practice also has a history in the sport of making careers: a fighter who steps in on short notice and wins can leapfrog a division's contenders. That is the reason fighters accept the job. They are cutting weight for a fight that probably will not happen, in exchange for the possibility that it will.

Repeat offenders and the limits on regaining weight

Missing weight once is a mistake. Missing it repeatedly becomes a matchmaking problem, and the UFC has dealt with serial misses by telling fighters to move up a division. It does not publish a rule on how many misses trigger the order. It simply stops booking a fighter at the weight he cannot make, and the fighter either moves up or leaves.

Commissions have their own tools. California, under a program announced in 2017, checks fighters' weights again on fight night and records how much they have regained since the official weigh-in. A fighter who regains more than about ten percent of body weight can be told by the commission that the division is not the right one and recommended to move up. A commission can also refuse to license a fighter at a weight it considers unsafe. The intent is to stop a fighter from dehydrating far below fighting weight on the day before and arriving at fight night a division heavier.

The Association of Boxing Commissions adopted additional MMA weight classes in 2017, including 165, 175, 195 and 225 pounds, to give fighters more options between the existing limits. The UFC had not adopted them as divisions through 2025, which is one reason the fight-night regain issue persists: a fighter who walks around at 180 has to choose between cutting to 170 or fighting at 185.

Flyweight to bantamweight10pounds

Bantamweight to featherweight10pounds

Featherweight to lightweight10pounds

Lightweight to welterweight15pounds

Welterweight to middleweight15pounds

Middleweight to light heavyweight20pounds

Light heavyweight to heavyweight60pounds

Difference in pounds between each division's upper limit and the one below. Women's divisions follow the 10-pound steps from 115 to 145.

Show the numbers

Gaps between neighboring UFC men's divisions

Item	Value
Flyweight to bantamweight	10pounds
Bantamweight to featherweight	10pounds
Featherweight to lightweight	10pounds
Lightweight to welterweight	15pounds
Welterweight to middleweight	15pounds
Middleweight to light heavyweight	20pounds
Light heavyweight to heavyweight	60pounds

The chart shows why the cut is hardest in the middle of the scale. Moving up from lightweight to welterweight is a 15-pound jump, and from middleweight to light heavyweight is 20. A fighter who is too big for one division may be too small for the next.

How the UFC weigh-in differs from boxing's

Boxing and the UFC share commissions, inspectors and scales, so their weigh-ins look similar. The details are not the same.

In professional boxing the weigh-in is still usually the day before, often in the afternoon, and it doubles as the public event: there is no separate morning weigh-in with a ceremonial version later in many shows. More important, boxing's sanctioning bodies impose their own weight rules on title fights. The International Boxing Federation holds a second-day weight check on the morning of the fight, at which a fighter may not be more than ten pounds over the division limit. A fighter who fails it cannot win the IBF title. The World Boxing Council has its own procedures, with weight checks in the weeks before a title fight. Our explainer on the four boxing sanctioning bodies covers how those organizations differ.

Boxing also has rehydration clauses. In a contract fight, especially at a catchweight, the two camps can agree that a fighter will not exceed a set weight on fight night, and a commission will weigh the fighter again to enforce it. The UFC does not use rehydration clauses, and most American states do not check weight on fight night in MMA, with California's regain check the main exception.

One promotion, one practice

The deepest difference is structural. In boxing, the weigh-in rules depend on the promoter, the sanctioning body, the commission and the contract, and they can differ from fight to fight. In the UFC, one promotion applies one practice across every division and every card: morning weigh-in in a window of about two hours, one-pound allowance in non-title bouts, none in title fights, purse penalty, no bonus. The commission enforces it and the promotion follows it. The combat sports hub on this site has more on both sports, and the details of how a bout is scheduled once both fighters have made weight, rounds and all, are in our guide to how many rounds a UFC fight has.